: Competitive Binding Immunoenzymatic Assay
: Specimens collected before 10AM: 3.7-19.4mcg/dL; Specimens collected after 5 PM: 2.9-17.3
: Light green PST (Lithium Heparin with gel) tube - 4.5 mL
: 1 light green top microtainer
: 1 mL plasma
: 0.3 mL plasma
: Centrifuge immediately and store at 2-8 degrees C.
: Refrigerated (2 - 8 C) : up to 14 days Frozen (-20 C) : 30 days Avoid multiple freeze/thaw cycles
Reasons for Rejection
: Hemolysis; improper collection
: STAT: 1 hour; ROUTINE: 2 hours after receiving in lab
: The Endocrine Society suggests a cut off of < 1.8 mcg/dL 8 hours after 1 mg Overnight Dexamethasone Suppression test or 2 hours after the last dose in the Longer Low dose Dexamethasone Suppression Test.
Search Options for the Test Directory:
1. Enter the test name in the Keyword search field.
Hint: You can also enter any part of the test name to expand the search.
(Example: you can type "west" or "sed" or "rate" to find Westergren Sedimentation Rate)
2. Enter the Vanderbilt Test Code, if known.
3. Choose one of the letter boxes to display a list of all test names and keywords starting with that letter.
If you are unable to find a test in our directory, please contact VPLS at
1-800-551-5227 or e-mail email@example.com.